The thing is, Mrs. Pooja, that most Ayurvedic medicines contains IRON as bhasma or churnas and most of those medics don't know about real thalassemia major but they eventually consider it sometimes as that the child may having lack of iron, and hence giving such medicines; hence why I won't recommend. But powers like Triphala, sudarshan dhanvati, methi powder,etc keeps body's antibody well protected from various viruses and germs, which is only what I can recommend.
-P.